Q1. You have been appointed as the Second Engineer of an eight years old vessel, recently purchased by your shipping company. Write a report to the engineering superintendent covering the inspection of main propulsion machinery carried out by you, to ensure its trouble free operation.
Q7. With respect to Energy efficient running of ships;
(a) Sketch and explain the optimization of propeller hull interface flow devices and improvement of propulsion efficiency.
(b) sketch and explain the optimization of Auxiliary machinery using VFDs.
Q9. Sketch and describe the refrigeration system of a container carrying bananas only. How does the controlled atmosphere of the container extend the green life and shelf life of bananas? How is the airflow system designed?
Q7. With reference to Gear pumps used for lubricating oil transfer.
(a) Sketch and describe a gear type pump indicating the flow of fluid.
(b) state the materials that gear type pump components may be manufactured from.
(c) specify THREE applications that are suitable for the employment of gear type pumps.
Q2. Cast iron is most widely used metal after steel in Marine Engineering. Most cast irons consist of graphite in steel like matrix. Discuss the variation of properties that may arise with reference to pearlitic grey cast iron and spherical grey cast iron. Describe briefly the treatment necessary to produce these two types of Irons.
Q9. Reverse osmosis is one of the alternative method for shipboard production of drinking water.
(a) Describe using simple diagrams if necessary, the principle of reverse osmosis.
(b) (i) Sketch a line diagram showing a single pass system for producing fresh water from sea water
(ii) Describe such a system.
Q2. A. Describe the procedure to be adopted for the inspection of a safety valve fitted to an exhaust gas fired auxiliary boiler stating, with reasons, which parts should receive particularly close attention.
B. Describe the procedure for the setting of safety valves of exhaust gas operated auxiliary boilers;
C. Explain the required action a watch-keeping engineer should take after the setting of safety valves as in (B)
Q8. With reference to Air-conditioning system onboard your vessel:
(a) Sketch and describe high pressure cut-out in a refrigeration system.
(b) The refrigeration compressor has stopped due to operation of the h.p cut-out Explain.
(i) The possible cause.
(ii) How these causes would be found and possible remedies.
(c) What steps are taken if the compressor “short-cycle” on low pressure cut-out?
Q9. With reference to Inert Gas Generator fitted on gas carriers:
a. Sketch a line diagram showing a typical 'Inert Gas System' used for inerting in gas carriers, labeling the component parts.
b. Describe the system.
c. State the function of a chiller used in this type of inert gas generator.
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